28 Nov
2015
28 Nov
'15
3:03 p.m.
On 2015-11-28 5:24 PM, rod wrote:
Hi
I had the exact same fault on my VAX.
I took one look at the PSU and ordered up another one pronto.
Trouble shoot in that small space no thank you.
It works just fine. One day a VAX PSU guru will tell us how to fix it.
Indeed, one day we will have the technology! Cryofreeze it until then.
--T
Rod Smallwood
On 28/11/15 21:09, Robert Jarratt wrote:
I had my own episode last week when I turned on my VAX 4000-500 after
a few months of not running it. It ran for a few minutes and then
powered off. Now it won't power on for more than a few seconds before
cutting out. This is the second PSU to do this to me (the first
actually failed outright) and I am wondering if the fault is with
something in the machine itself rather than the PSU. Although, now,
even with different combinations of boards removed (so there is at
least some load), the PSU won't stay on for long, so I don't think it
can be one of the boards, but perhaps something in the machine has
caused a fault which has now damaged the PSU. I have another spare PSU
but I am not going to risk it yet until I have had time to investigate.
Regards
Rob
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Terry
Stewart
Sent: 28 November 2015 20:05
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: A stored collection piece is a Schrodinger's cat
I agree with Mark, needs more upwards
arrows, more cycles (some
without an exit at the bottom). :-)
I see a big problem with this flowchart, the path
on the far right does
not exist, please delete it and then the flowchart will be
believable.
..
I do think there are not nearly enough arrows
pointing upwards
LOL Rob, Mark. Today
it's all going to come together and hopefully the outcome will be
a fully working PET4032 and an extra diagnostic tool to add to the
collection.
Of course we all know something ELSE unexpected
will happen.
Yes, I love the case design of the PET. It looks just so retro and
'80s futuristic if
you get my meaning...
I designed that tounge-in-cheek flowchart as a kind of catharsis
having just
spent the last three weeks, firstly fixing my Apple II+ which was a
non-starter
on checking (a faulty F8 ROM in that case) then followed by the next
unit I
tested, whose 74LS500 in the video circuit failed after about 5
mins. I'm almost
afraid to turn on any more...but then...Schrodinger's cat
and all that. I need to know!
Terry (Tez)